The Union Auxiliary Guards

Marshal Bazaine would rise from private to Marshal of France and to the command the French Army in Mexico, from Wikipedia:

François Achille Bazaine - Wikipedia François Achille Bazaine (French pronunciation: [frɑ̃swa aʃil bazɛn]; 13 February 1811[1][2] – 23 September 1888) was an officer of the French army. Bazaine rose through the ranks over four decades of distinguished service (including 35 years on campaign) under Louis Philippe and then Napole....